Security readout for executives and security teams
Plain-English summary
CVE-2021-40511 describes a denial-of-service risk in OBDA Systems Mastro 1.0 caused by XML entity expansion. A vulnerable XML parser can consume excessive resources when processing malicious XML. The public bundle does not provide severity scoring, patch details, or evidence of active exploitation.
Executive priority
Treat this as a targeted availability risk if Mastro 1.0 supports important business workflows. Priority should rise if XML processing is exposed to untrusted users or external integrations. Evidence is insufficient to justify emergency action without confirmed exposure.
Technical view
The record states Mastro 1.0 is vulnerable to XML Entity Expansion, also called a billion laughs attack, allowing denial of service. No CVSS, CWE, affected CPEs, exploit evidence, or remediation version is provided in the supplied sources.
Likely exposure
Exposure is most likely limited to organizations running OBDA Systems Mastro 1.0, especially where the product processes XML from uploads, integrations, or untrusted users. The supplied sources do not confirm deployment patterns or internet-facing components.
Exploitation context
The source bundle supports denial of service through XML entity expansion only. It does not support claims of code execution, data theft, authentication bypass, public exploit availability, or active exploitation. KEV status is false.
Researcher notes
The record is sparse: no CVSS vector, CWE mapping, affected CPE, patch version, or detailed advisory content is included. Analysis should focus on confirming product use, XML parser exposure, and vendor remediation rather than assuming broader impact.
Mitigation direction
- Identify whether Mastro 1.0 is deployed in your environment.
- Check OBDA Systems and CyberiskVision guidance for fixes or safe configuration.
- Restrict XML-processing access to trusted users and systems.
- Block untrusted XML ingestion until vendor remediation is confirmed.
- Monitor affected systems for abnormal CPU, memory, or service restarts.
Validation and detection
- Inventory installed Mastro versions and confirm any Mastro 1.0 instances.
- Map workflows where Mastro receives or parses XML content.
- Review access controls around XML import or integration endpoints.
- Check logs for resource exhaustion events during XML processing.
- Track vendor or advisory updates for remediation details.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2021-40511 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://www.obdasystems.com/mastroCVE reference · x_refsource_MISC
- https://www.cyberiskvision.com/advisory/CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.